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Investigating the relationship between obsessive-compulsive symptomatology and executive functions. By: Connor Heapy A thesis submitted for the degree of Doctor of Philosophy The University of Sheffield Faculty of Science Department of Psychology Submission Date: 15/02/2018 Investigating the relationship between obsessive-compulsive symptomatology and executive functions. Abstract This thesis aimed to investigate the relationship between obsessive-compulsive symptoms (particularly obsessive intrusive thoughts) and executive functions (particularly working memory). Previous research had demonstrated executive function (EF) deficits in individuals with OCD. Executive functions are those cognitive mechanisms that help to control and regulate thoughts and behaviour. However, several questions remained unanswered: 1) do individuals with subclinical OCD also demonstrate EF deficits? 2) Are those EF deficits found in individuals with OCD trait in nature, or caused by state factors? 3) Are EFs implicated in OCD-relevant processes, such as thought control strategies? Three studies were conducted to help investigate these questions further. The study presented in chapter two found no difference between individuals with subclinical OCD and nonclinical individuals on a range of executive function tasks. The study presented in chapter three found that an increase in obsessive intrusive thoughts did not lead to impairments in working memory. The study presented in chapter four found no relationship between working memory and an individual’s ability to dismiss obsessive intrusive thoughts. The implications of the results from this thesis are discussed and future directions are suggested. 2 Investigating the relationship between obsessive-compulsive symptomatology and executive functions. Acknowledgements First and foremost, I would like to thank my supervisors, Lisa-Marie Emerson and Dan Carroll, for all of the academic and personal support that they have provided throughout my PhD. Their patience, encouragement, and expertise have meant that my PhD has been an extremely rewarding and enjoyable experience. Thank you to the department of psychology for providing me with the funding necessary for me to complete a PhD. And thank you to all of the staff and students at the university who have participated in the studies included within this thesis. I would also like to thank all of my friends, of which there are too many to name, for their ongoing friendship and support. And thank you to Anna for tolerating all of my complaints, grumpiness, and general negativity during the final stages of my PhD. Finally, I’d like to thank all of my family, and particularly my parents, for a lifetime of love and support. 3 Investigating the relationship between obsessive-compulsive symptomatology and executive functions. Chapter 1 – Introduction to obsessive-compulsive disorder, obsessive intrusive thoughts and executive functions. 5 1.1: Chapter overview 5 1.2: Obsessive-compulsive disorder, obsessive intrusive thoughts and cognitive theories of OCD 6 1.3: The role of executive functions in obsessive-compulsive disorder and subclinical obsessive-compulsive disorder 25 1.4: Thesis overview 35 Chapter 2: Executive functioning in subclinical obsessive-compulsive disorder 38 2.1: Method 51 2.2: Results 56 2.3: Discussion 63 Chapter 3: Mechanisms of OCD: Do obsessive-intrusive thoughts impair working memory? 70 3.1: Method 82 3.2: Results 88 3.3: Discussion 96 Chapter 4: The relationship between working memory and obsessive intrusive thought dismissibility. 106 4.1: Method 125 4.2: Results 132 4.3: Discussion 137 Chapter 5: General Discussion 144 References 157 4 Investigating the relationship between obsessive-compulsive symptomatology and executive functions. Chapter 1 – Introduction to obsessive-compulsive disorder, obsessive intrusive thoughts and executive functions. 1.1: Chapter overview In this chapter, I will first introduce obsessive-compulsive disorder (OCD) and focus particularly on one core symptom – obsessive intrusive thoughts (OITs). I will then introduce current cognitive theories of OCD, and describe the factors that these theories posit are important in the development and maintenance of OCD. I will also introduce the continuum model of OITs; the idea that OITs are experienced by all individuals but vary in some fundamental ways, such as frequency and associated distress. Those with OCD experience OITs at the clinical extreme end of the continuum. I will then describe some contested claims of cognitive theories of OCD and list some unanswered questions. Following this, I will introduce “subclinical obsessive-compulsive disorder” and explain how research into such samples can increase our understanding of OCD. Next, I will introduce executive functions in OCD and subclinical OCD, and explain how they may help to answer some unresolved questions in OCD research. Executive functions are those cognitive mechanisms that control and manage other lower-level cognitive processes and thereby facilitate self- directed behaviour toward a goal (Banich, 2009). Finally, I will describe an alternative possibility, that EFs are simply a consequence of OCD phenomena and may not provide any useful information about the development and maintenance of OCD. 5 Investigating the relationship between obsessive-compulsive symptomatology and executive functions. 1.2: Obsessive-compulsive disorder, obsessive intrusive thoughts and cognitive theories of OCD Obsessive compulsive disorder (OCD) is a mental health disorder characterized by unwanted thoughts, images or impulses alongside ritualistic mental or behavioural acts (American Psychiatric Association [APA], 2013). These characteristics of OCD can vary significantly between individuals and as a result, OCD is considered a heterogeneous condition (e.g. Markarian et al., 2010; McKay et al., 2004). Obsessive compulsive disorder affects 1-3 percent of the population at some point in their life time (Rasmussen & Eisen, 1994; Kessler et al., 2005; Torres et al., 2006) and is associated with significant impairments in functioning and quality of life (Eisen, Stouf, & Rasmussen, 2006; Markarian et al., 2010). For example, individuals with a diagnosis of OCD may experience disturbed sleep and disrupted occupational functioning (such as loss of work; Markarian et al., 2010) and symptom severity has been found to negatively correlate with quality of life (Eisen et al., 2006). In addition to this, 60-90% of individuals with OCD present with at least one other psychological disorder, such as depression or anxiety (Ruscio, Stein, Chiu, & Kessler, 2010; Torres et al., 2006). Defining obsessive intrusive thoughts The unwanted thoughts, images and impulses that are characteristic of OCD are often referred to as obsessive intrusive thoughts (OITs). However, currently there is no universally accepted definition of OITs, which is problematic for assessing and understanding OITs (Julien, O’Connor, & Aardema, 2007). This lack of a universal definition of OITs ultimately has a 6 Investigating the relationship between obsessive-compulsive symptomatology and executive functions. negative impact on understanding the development and maintenance of OCD. It is therefore important to define OITs in the most accurate way. One of the difficulties with forming a definition of OITs is that within the literature the terms “intrusive thoughts”, “intrusions”, “cognitive intrusions”, “unwanted intrusive thoughts” and “obsessive intrusive thoughts” are often used interchangeably (Julien et al., 2007). In addition, there are a range of similar types of thought which are often confused with OITs, such as negative automatic thoughts, worry, and task-unrelated thoughts. In order to form an accurate and universally acceptable definition of OIT, it is therefore important to consider the commonalities between current definitions, as well as the differences between OITs and other types of thought. One way of assessing commonalities between OIT definitions, and a way of helping to form a precise definition, is to consider both process characteristics and content (Clark & Purdon, 1995). Process characteristics refer to the form that the thoughts take; for example, repetitiveness. Content refers to thematic characteristics of the OIT; for example, aggression. In terms of process characteristics, most definitions describe OITs as presenting not only in the form of thoughts, but also in the form of images (e.g. the image of carrying out a repulsive sexual act) or impulses (e.g. the impulse to jump from a great height). Obsessive intrusive thoughts are also often described as being unwanted, due to the anxiety-provoking content of the thoughts, and the negative impact that the thoughts can have on day-to-day life (Clark & Rhyno, 2005). The spontaneous nature of the thoughts is also captured by most definitions, as OITs appear suddenly into conscious awareness. In addition, OITs are often described as recurrent or repetitive, and difficult to control 7 Investigating the relationship between obsessive-compulsive symptomatology and executive functions. (Clark & Rhyno, 2005; Julien et al., 2007). Finally, OITs are frequently described as interrupting the task at hand, often because they are discordant with what a person is thinking or doing at the time of the thought (Clark & Rhyno, 2005; Julien et al., 2007). Whereas process characteristics have been captured by most definitions of OITs, content has generally been ignored. In a study which used the most comprehensive
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